There's this little bookstore where I live that has a secluded room towards the rear of the building that is packed with old and antique books. I'll often just go and pull random books from the shelves and carefully inspect them for quality textures. For this set I took a propane torch to the edges of the paper to give the that vintage burned look. Enjoy!
Caleb Kimbrough is the man behind LostAndTaken.com, a blog solely focused on giving away free high-res textures.